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try to submerge the steam tip into the milk, turn steam on at full power then slowly lower the pitcher until you hear a soft hiss. You should be able to use 1/3 milk in a 20oz pitcher and have the steam on at full power without any milk explosion. It is easier to learn on 20oz pitcher then on 12oz pitcher. The less milk you use the harder it is. Even if you want to learn on milk, you should still watch Scott Rao's soapy water video. The technique is the same.The pitcher I'm using now is too large. I think 20oz. I'm getting a 12oz soon. I usually fill the pitcher up about 2/3. I try to keep the tip just a bit below the surface
3 months is about the time I let them serve customers under supervision. Milk steaming and latte art is part of the process, I am more concern about pulling decent shots, but most new baristi want to learn latte art so they care more about milk steaming.Pug, if some of the people you train take up to 3 months to "get it" maybe they should look into other work options. Espresso can take some time to master with different coffees, equipment, environment, etc... but milk texturing on commercial equipment should take a few weeks MAX in my opinion.
Make sure your thermometer is set correctly by doing the ice water and boiling water test. You should also try to stop at around 135 ~ 140.I have been using a thermometer (not digital, though). I usually turn the knob before it reaches 155-160
The video was very clear about the temperature, ie the hand on pitcher method when you feel the first sign of pain stop steaming. You can also use a thermometer with soap and water if you are concern about not knowing the temperature. The only true disadvantage is you can't taste it.Watched the video and find it hilarious. Looks/texture mean nothing if the milk gets scalded, which is why I recommend using milk to begin with as one should taste the differences in texturing as they advance.
Sara, do yourself a favor and get a decent digital thermometer for steaming. The hand-on-pitcher method is OK, but not nearly as precise and consistent as a good thermometer.